Loom-dobby.



W. SCHENKA.

LOOM DOBBY.

APPLICATION FILED JUNE 30,1915.

1,159,999. Patented Nov. 9,- 1915.

COLUMBIA PLANOGRAPH co.,wA5l-||Na1'aN. D. c.

EINI A 1. 'r are LOO'M-DOBBY.

Application filed June 30, 1915.

To all whom it may concern:

Be it known that I, W ILHELM SCHENKA, a, subject of the Emperor of Germany, residing at Forst, i. d. Lausitz, Mark Brandenburg, Germany, have invented Certain new and useful Improvements in Loom-Dobbies, of which the following is a specification.

This invention has for its object to provide an improved loom dobby of the type comprising two-armed, that is, intermediately fulcrumed, horizontal drawhooks which are connected directly to the heald levers or jack levers. Drawhorks of that kind have already been constructed by making one arm of the drawhook heavier than the other arm, so that when it was not raised, it engaged automatically with its knife. When however, the lighter arm of the draw hook had to engage its knife, and to remain securely in its engaged position. not only was it necessary to raise the heavier part of the drawhook, but the partthat effected this raising, supported the heavier drawhook portion during the movement of the knife. That arrangement had the drawback that the raising of the heavier drawhook portion was not insured, especially its protracted support in its raised position. If the lighter drawhook portion did not come into engagement with its knife, or disengagement took place prematurely, then the most serious disturbances occurred in the working. over the high speed of all power looms must be taken into consideration. The operation became still more uncertain when the raising of the heavier drawhook portion was effected by means of an independent intermediate member. Now those drawbacks are remedied by the improvements of the present invention accordin to which verticallv movable pegs actuated by a lattice or peg barrel in the usual manner. are employed to raise the heavier drawhook portion outside of its shoulder that is designed to engage the knife, and that, after this raising, the heavier drawhook portion supported on its knife, takes over immediately after the commencement of the movement of the knife, the insuring of the engagement of the lighter drawhook portion with its knife, while completely relieving the peg of its load.

Reference is now to be had to the accompan ing drawings. in which:

Figure 1 is a diagrammatic view of a loom dobby embodying one form of the improve- Specification of Letters Patent.

More-' Patented Nov. 9, 1915.

Serial No. 37,362.

ments of the present invention, the parts thereof being shown in position for a closed shed. Fig. Qis a similar view of the loom dobby with its parts in position for an open shed.

In the example shown, al and a are the heald levers or jacks to which the wires, straps or cords for the healds are connected. The heald levers a and a carry pivoted to them, the horizontal drawhooks b and 6 which are intended to coE-perate with the knives c and 0 The horizontal drawhooks b and are constituted by arms d 6 and (Z 0 of which the arms 6 and 6 are the heavier and are formed with extensions 1 and g beyond the shoulders f and f that are designed to engage theknife 0 it indicates one of the vertically movable pegs operated by the lattice or peg barrel.

In Fig. 1, the knives c, and 0 are shown pushed together as far as possible; this position corresponds to the closing of the shed. The lattice barrel then raises by its pegs a part of the horizontal drawhooks, for instance 7),, so that the lighter end of the drawhook comes into engagement with the knife 0 The horizontal drawhooks for instance b hang with their heavier hook part a, downward, and engage therewith the knife 0 The knives c, and 0 now move apart; the engagement of the knife 0 with the horizontal drawhook 6 being insured by reason of the weight of the drawhook part 0 The engagement of the lighter drawhook d, with the knife 0 is insured by the circumstance that immediately the knives move apart, the heavier drawhook part c, (if the friction between the shoulder of the drawhook and the knife 0, is not sufficient to keep these parts from relative movement) moves down upon the knife 0 and remains permanently supported by this knife. It will be understood that the slight downward movement of the part 6 (if such occurs) is not sufficient to disengage the shoulder of the drawhook from the knife 0,. The peg 71 has moved back immediately, and it does not come into injurious contact with the horizontal drawhook 1), during the movement of the latter. This is shown in Fig. 2.

hat I claim is 1. In a loom dobby the combination of horizontal drawhooks pivoted directly to the heald or jack levers intermediate of the ends of said drawhooks, dobby knives arranged adjacent to said dravvhooks, projecfl tions on each side of the pivot of said drawhooks forming shoulders for engagement with said dobhy knives, each of said drawhooks being heavier on one side of its pivot' movable pegs adapted to engage the heavy ends of said drawhooks so as to raise same, and a lattice or peg barrel for operating said pegs and permitting any raised pegs to be lowered immediately after, the commencement of lateral movement of the; knives, the disengaged ends of the corresponding drawhooks, if said ends are r lowered, being brought into slidable contact with the adjacent dobby knife and the shoulders at the opposite ends maintained in. engagement with their dobb; knife throughout the lateral movement of the knives.

:2. In a loom dobby the combination of horizontal drawhooks pivoted directly to the heald or jack levers intermediate of the ends of said drawhooks, (lobby, knives arranged below and adjacent to said drawhooks,

downward projections on each end of said drawhooks forming shoulders for engagement with said dobby knives, each of said drawhooks being heavier on one side of its pivot than on the other so as to tend to keep the shoulder on the latter side out of engagement With its dobby knife and the gliding engagement with the adjacent dobb' g knife and the shoulders at the lighter ends maintained in engagement with their dobby knife throughout the lateral movement of the knives.

In testimony whereof I have signed my 50 name in, this specification. V

' WILHELM S'CHENKA.

Copies of this patent may be obtained for five cents eaclyby addressing'ithe Commissioner of Patents,

Washington, D. G.

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